First, thank you for taking the time to help me. You are correct, I"m using a red 16oz cup. I've already ordered a DE Scoop cup last night. For now, is there an easy to way to figure out how much DE i need using my plastic cup?

Also, how do I run the pump on high speed? I know there are main drains and skimmer drains. I do have 2 pipes coming into my pump and 2 going back out. But they are not labeled. I assume I need to shut off the main drain and do only skimmer and that would run my pump on high speed? I'm trying to insert a pic but I can't figure out how.